Paranoid about FULL setup on new PowerBook

Just updated my 2003 G4 PowerBook with the 2.66GHz 13" i7 PowerBook Pro. My old G4 is running so slow that when ever I do video I go through Mac Janitor, Disk Utility, reboot and make sure the AirPort is OFF and FCP manages to work for about 20-30 mins then it can't handle more that 4 or 5 layers. Managed to get that Stupid Trojan Horse the redirects URLs in Safari and CAN NOT get rid of it, so ...
I am REALLY Paranoid about setting any web stuff at all on the new one. Just putting FCP Studio, After Effects, Photoshop and any other video programs on it. Used the web to update drivers but NO MAIL tool.
My plan is to use the G4 for internet stuff, script writing (I guess that could go into the new one) and anything NONE VIDEO. Probably wouldn't have updated the G4 if I hadn't just bought an HD video cam that uses AVCHD and needed an Intel chip.
SOOO... Am I crazy? Or what?

Malware is always looking for lazy users, or that more than half will still click on and open email junk, spam, phising and URLs.
The most recent java hole, Windows only, required zero action from user except for a web page to load.
Security is gradually being taken more seriously.
I'd guess your i7 has enough RAM, power, and faster disk I/O (and nice new and clean) that it isn't bogged down as easily. Still a good idea from time to time to clean out caches and such.
There have been cpu resource bugs in audio codec in 10.6.2+ (just playing iTunes or other media, external speakers, Firewire audio) affecting Nehalem-based Macs.
On your PC I'd use MS Security Essentials, but on Mac... ClamXav (part of the Snow Leopard Cache Cleaner utility $9) - I've been using Panther-Tiger and later versions of the utility and found, when there is something to deal with, to be a good and well supported tool.
Windows 7 is hardened and rugged, for driving down streets of Baghdad during a firefight, while OS X is safe only by small target, not beause it is inherently more secure though. (And that isn't just me talking but others, too.)

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